Use a paper towel to pat the steak cubes completely dry. Place them in a bowl, sprinkle with your steak seasoning, and toss until every piece is evenly coated.
Preheat your Blackstone griddle to high heat. You want the surface smoking hot to achieve the best possible sear.
Drizzle the vegetable oil onto the hot griddle. Place the steak cubes onto the surface, ensuring they are spread out in a single layer with space between each piece.
Let the meat sear completely undisturbed for about 2 minutes to develop a dark, caramelized crust on the bottom.
Use your spatulas to flip the steak bites and sear for another 1-2 minutes on the other side.
Turn the heat down to low. Drop the butter and minced garlic directly onto the griddle right next to the sizzling steak bites.
As soon as the butter melts and the garlic becomes fragrant (about 30 seconds—do not let the garlic burn!), aggressively toss the steak bites through the garlic butter until they are beautifully coated.
Remove the steak bites from the griddle immediately to prevent overcooking. Garnish with fresh chopped parsley and serve hot!